<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <!-- <ul>
            <li v-for="item of items">
                姓名：{{item.name}}<br>
                年龄：{{item.age}}
            </li>
        </ul> -->
        <ul>
            <!-- in -->
            <!-- key是维护状态 -->
            <li v-for="(item,key,index) in user" :key="index">
             {{index}} ---  {{key}} --- {{item}}
            </li>
        </ul>
    </div>
    <script>
        let vm = new Vue({
            el:"#app",
            data() {
                return {
                    items:[
                        {name:"mayuahng",age:"19"},
                        {name:"alibaba",age:"111"},
                        {name:"aliyeye",age:"1229"}
                    ],
                    user:{
                        name:"aliyeye",
                        age:1999,
                        email:"3945@qq.ciom"
                    }
                }
            },
        });
    </script>
</body>

</html>